TagWAC(40)

This Washington State regulation (WAC 173-340-747) establishes methods for determining safe soil contamination levels that protect groundwater quality at cleanup sites. It outlines several scientific approaches, including three-phase and four-phase partitioning models, leaching tests, and empirical demonstrations, to calculate the maximum allowable concentration of hazardous substances in soil before they risk contaminating groundwater. The regulation requires that soil concentrations not cause groundwater cleanup level exceedances and not result in the buildup of nonaqueous phase liquids in or on groundwater.

Exhibit AR017360, Part IX Tables from MTCA Cleanup Regulation WAC 173-340-900, dated February 12, 2001. Contains Table 720-1, Method A Cleanup Levels for Ground Water, listing hazardous substances including arsenic, benzene, benzo(a)pyrene, cadmium, chromium, DDT, 1,2-dichloroethane (EDC), ethylbenzene, ethylene dibromide (EDB), lead, lindane, methylene chloride, mercury, MTBE, naphthalenes, PCB mixtures, radium 226, tetrachloroethylene, toluene, trichloroethylene,

Washington Administrative Code (WAC) 173-201A sections 030, 040, 050, and 060 covering water quality standards for surface waters in Washington State, published by the Washington State Department of Ecology. Exhibit 113 (AR017890–AR017892) includes: lake total phosphorus (TP) nutrient criteria by ecoregion (Cascades, Columbia Basin, Willamette, East Cascade Foothills, Blue Mountain) with trophic state classifications (ultra-oligotrophic,

Email chain (AR 017786-017788, DOE S-13:01 0884-0886) forwarded by Joan Marchioro (ATG) to Raymond Hellwig on November 22, 2000, originating from Peter Kmet to Chung K. Yee on September 11, 2000, marked not for production as deliberative. Discusses proposed new Method A soil cleanup levels under MTCA (Model Toxics Control Act), WAC 173-340-708(b), with attached

Letter dated November 22, 2000 from Bill Garrity, Executive Director of the Consulting Engineers Council of Washington (CECW), to Erik Stockdale at the Washington Department of Ecology (AR 018492–018493). The letter addresses the Request for Bid (RFP dated November 14, 2000) for review of the Natural Resource Mitigation Plan (NRMP) for the SeaTac Third Runway

Email dated November 15, 2000 from Chung K. Yee to Kevin Fitzpatrick regarding Sea-Tac fill dirt, specifically the ‘Black’ virgin site where soil samples exceeded Method B 100X groundwater standards under MTCA (Model Toxics Control Act). The site holds 200,000 to 300,000 cubic yards of fill and is workable during winter months. Beth Clark arranged

Agenda for Port Of Seattle Third Runway Flow Augmentation/Water Rights meeting dated October 31, 2000, with handwritten notes. Attendees included Port Of Seattle, Department of Ecology, Attorney General’s Office, and Seattle Public Utilities (SPU). Topics covered potential sources of stream flow augmentation water for Des Moines Creek: SPU Highline Well Field, Highline Water District Well

Facsimile cover sheet from Elizabeth Leavitt, Manager, Aviation Environmental Programs, Port Of Seattle, transmitting a 7-page package to Tom Luster (Ecology) and Eric Stockdale (NWRO) regarding the Auburn HPAD and shoreline exemptions. Includes August 9, 2000 letter from City of Auburn Planning Director Paul Krauss to Elizabeth Leavitt and Robert J. Fritzen (Department of Ecology,

Annual Stormwater Monitoring Report for Seattle-Tacoma International Airport (Sea-Tac Airport) covering July 1, 1998 through June 30, 1999, prepared by Port Of Seattle, September 1999 (AR 026459–AR 026461). Includes stormwater quality data tables for outfalls SDE4, SDS3, SDN1, and SDN4 with copper (CAS No. 7440-50-8) concentration measurements in micrograms per liter, hardness-dependent freshwater acute water

King County Superior Court Memorandum Ruling by Judge Robert H. Alsdorf on Application of WAC Chapter 365-195 (Procedural Criteria for Adopting Comprehensive Plans and Development Regulations) in consolidated cases No. 96-2-20357-2 KNT, No. 97-2-13908-2 KNT, No. 97-2-22276-1 KNT, No. 98-2-04911-1 KNT. City of Des Moines, Airport Communities Coalition, and other plaintiff-petitioners argued against the Port